From 566d1807fe5a63a3071f9b559438b60761512069 Mon Sep 17 00:00:00 2001
From: Jan Koppe <post@jankoppe.de>
Date: Fri, 1 Nov 2024 21:31:38 +0100
Subject: [PATCH] render script for chunked recordings v1: it's slow, but it
 works

---
 dhcp2024/render-chunks.sh | 135 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100755 dhcp2024/render-chunks.sh

diff --git a/dhcp2024/render-chunks.sh b/dhcp2024/render-chunks.sh
new file mode 100755
index 0000000..f5eb5d5
--- /dev/null
+++ b/dhcp2024/render-chunks.sh
@@ -0,0 +1,135 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+# This script requires you to have ffmpeg and fzf installed.
+which ffmpeg >/dev/null || (echo "Please install ffmpeg" ; exit 1)
+which fzf >/dev/null || (echo "Please install fzf" ; exit 1)
+which mpv >/dev/null || (echo "Please install mpv" ; exit 1)
+
+INTROS_PATH="/Users/j/dhcp24_voc_files/intros"
+OUTROS_PATH="/Users/j/dhcp24_voc_files/outros"
+CHUNKS_PATH="/Users/j/voc_obs/obs_record"
+OUTPUT_PATH="/Users/j/voc_obs/obs_record/rendered"
+
+# Select the appropriate files
+SELECTED_INTRO="$(find  "$INTROS_PATH" -type f | sort --reverse --human-numeric-sort | fzf --delimiter / --with-nth -1 --prompt "Intro File:")"
+SELECTED_OUTRO="$(find  "$OUTROS_PATH" -type f | sort --reverse --human-numeric-sort | fzf --delimiter / --with-nth -1 --prompt "Outro File:")"
+SELECTED_CHUNKS="$(find "$CHUNKS_PATH" -type f | sort --reverse | fzf --delimiter / --with-nth -1 -m --prompt "Video Chunks (use tab to select multiple):" | sort )"
+readarray -t CHUNKS_ARRAY < <(echo "$SELECTED_CHUNKS")
+
+# find the start-offset for the first chunk
+read -p "Do you want to play the first chunk ${CHUNKS_ARRAY[0]} to find the start-offset? (y/n) [n]: " PLAY_FIRST_CHUNK
+PLAY_FIRST_CHUNK="${PLAY_FIRST_CHUNK:-n}"
+
+[[ "$PLAY_FIRST_CHUNK" == "y" ]] && mpv "${CHUNKS_ARRAY[0]}" --osd-level=3 --osd-status-msg='${=time-pos}' --really-quiet
+
+read -p "Enter the start-offset in seconds for the first chunk ${CHUNKS_ARRAY[0]} [0]: " START_OFFSET
+START_OFFSET="${START_OFFSET:-0}"
+
+
+# find the end-offset for the last chunk
+read -p "Do you want to play the last chunk ${CHUNKS_ARRAY[-1]} to find the end-offset? (y/n) [n]: " PLAY_LAST_CHUNK
+PLAY_LAST_CHUNK="${PLAY_LAST_CHUNK:-n}"
+
+[[ "$PLAY_LAST_CHUNK" == "y" ]] && mpv "${CHUNKS_ARRAY[-1]}" --osd-level=3 --osd-status-msg='${=time-pos}' --really-quiet
+
+read -p "Enter the end-offset in seconds for the last chunk ${CHUNKS_ARRAY[0]} [1]: " END_OFFSET
+END_OFFSET="${END_OFFSET:-1}"
+
+cat <<EOT
+
+
+
+I will be rendering with the following configuration:
+    + Selected Intro: ${SELECTED_INTRO}
+    + Selected Outro: ${SELECTED_OUTRO}
+    + Video Chunks:
+        + First chunk: ${CHUNKS_ARRAY[0]}
+          Starting at second ${START_OFFSET}
+        + Last chunk: ${CHUNKS_ARRAY[-1]}
+          Ending at second ${END_OFFSET}
+        + All chunks:
+EOT
+for index in "${!CHUNKS_ARRAY[@]}"
+do
+    echo "            + $index: ${CHUNKS_ARRAY[index]}"
+done
+echo ; echo ; echo
+read -p "Do you want to proceed with this configuration? (y/n) [y]" PROCEED
+PROCEED="${PROCEED:-y}"
+
+[[ "$PROCEED" == "y" ]] || (echo "aborting"; exit 1)
+echo "doing ffmpeg things here"
+
+ARRAY_LENGTH="${#CHUNKS_ARRAY[@]}"
+if [[ ${ARRAY_LENGTH} -lt 2 ]]
+then
+    echo "Too few chunks, this script can't handle this yet. Please do that on your own."
+    exit 1
+fi
+#ffmpeg -i "$SELECTED_INTRO" \
+#       -i "$SELECTED_OUTRO" \
+#    -ss "$START_OFFSET" -i "${CHUNKS_ARRAY[0]}" \
+echo    "${CHUNKS_ARRAY[@]:1:-2}"
+#    -t "$END_OFFSET" -i "${CHUNKS_ARRAY[-1]}" \
+# STEP 1
+# temp dir
+WORKDIR=$(mktemp -d)
+# STEP 2
+# introfile with first chunk and crossfade encode
+ffmpeg -i "$SELECTED_INTRO" -ss "$START_OFFSET" -i "${CHUNKS_ARRAY[0]}" \
+-filter_complex \
+"[1:v:0]fade=t=in:st=0:d=0.2[x];
+ [1:a:0]afade=t=in:st=0:d=0.2[a];
+ [0:v:0][0:a:0]
+ [x][a]
+ concat=n=2:v=1:a=1
+ [v0][a0]" \
+-map '[v0]' -map '[a0]' \
+-c:a aac -b:a 192k \
+-c:v libx264 -threads 0 -pix_fmt yuv420p -crf 18 -profile:v high -level 4.1 -disposition default \
+-metadata:s:a:0 language=native \
+"${WORKDIR}/introcombined.mkv"
+
+# STEP 3
+# outrofile with last chunk and corssface encode
+ffmpeg -i "$SELECTED_OUTRO" -t "$END_OFFSET" -i "${CHUNKS_ARRAY[-1]}" \
+-filter_complex \
+"[1:v:0]fade=t=out:st=$(($END_OFFSET - 1)):d=1.0[x];
+ [1:a:0]afade=t=out:st=$(($END_OFFSET - 1)):d=1.0[a];
+ [x][a]
+ [0:v:0][0:a:0]
+ concat=n=2:v=1:a=1
+ [v0][a0]" \
+-map '[v0]' -map '[a0]' \
+-c:a aac -b:a 192k \
+-c:v libx264 -threads 0 -pix_fmt yuv420p -crf 18 -profile:v high -level 4.1 -disposition default \
+-metadata:s:a:0 language=native \
+"${WORKDIR}/outrocombined.mkv"
+
+# STEP 4
+# encoded intro+outro and all chunks in between with c:v copy and audio dynnorm + encode
+
+FFMPEG_CHUNKS=""
+FFMPEG_CONCAT=""
+if [[ ${ARRAY_LENGTH} -gt 2 ]]
+then
+    for index in $(seq 1 $(( ${ARRAY_LENGTH} - 2 )) )
+    do
+        FFMPEG_CHUNKS="${FFMPEG_CHUNKS} -i ${CHUNKS_ARRAY[index]}"
+        FFMPEG_CONCAT="${FFMPEG_CONCAT} [$((index + 1)):v:0][$((index + 1)):a:0]"
+    done
+fi
+
+ffmpeg -i "${WORKDIR}/introcombined.mkv" -i "${WORKDIR}/outrocombined.mkv" \
+    $FFMPEG_CHUNKS -filter_complex \
+    "[0:v:0][0:a:0]
+    $FFMPEG_CONCAT
+    [1:v:0][1:a:0]
+    concat=n=${ARRAY_LENGTH}:v=1:a=1
+    [v][a];[a]dynaudnorm[ad]" \
+    -map '[v]' -map '[ad]' \
+    -c:v libx264 -threads 0 -pix_fmt yuv420p -crf 18 -profile:v high -level 4.1 -disposition default \
+    -c:a aac -b:a 192k \
+    -metadata:s:a:0 language=native \
+    "${OUTPUT_PATH}/combinedrender.mkv"